<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover focus behaviors</title>
<meta name="timeout" content="long">
<link rel="author" href="mailto:masonf@chromium.org">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/popover-utils.js"></script>

<div id=fixup>
  <button id=button1 tabindex="0">Button1</button>
  <div popover id=popover0  tabindex="0" style="top:300px">
  </div>
  <div popover id=popover1 style="top:100px">
    <button id=inside_popover1 tabindex="0">Inside1</button>
    <button id=invoker2 popovertarget=popover2 tabindex="0">Nested Invoker 2</button>
    <button id=inside_popover2 tabindex="0">Inside2</button>
  </div>
  <button id=button2 tabindex="0">Button2</button>
  <div popover id=popover_no_invoker tabindex="0" style="top:300px"></div>
  <button popovertarget=popover0 id=invoker0 tabindex="0">Invoker0</button>
  <button popovertarget=popover1 id=invoker1 tabindex="0">Invoker1</button>
  <button id=button3 tabindex="0">Button3</button>
  <div popover id=popover2 style="top:200px">
    <button id=inside_popover3 tabindex="0">Inside3</button>
    <button id=invoker3 popovertarget=popover3 tabindex="0">Nested Invoker 3</button>
  </div>
  <div popover id=popover3 style="top:300px">
    Non-focusable popover
  </div>
  <button id=button4 tabindex="0">Button4</button>
</div>
<style>
  #fixup [popover] {
    bottom:auto;
  }
</style>
<script>
async function verifyFocusOrder(order,description) {
  order[0].focus();
  for(let i=0;i<order.length;++i) {
    const control = order[i];
    assert_equals(document.activeElement,control,`${description}: Step ${i+1}`);
    await sendTab();
  }
  for(let i=order.length-1;i>=0;--i) {
    const control = order[i];
    await sendShiftTab();
    assert_equals(document.activeElement,control,`${description}: Step ${i+1} (backwards)`);
  }
}
promise_test(async t => {
  button1.focus();
  assert_equals(document.activeElement,button1);
  await sendTab();
  assert_equals(document.activeElement,button2,'Hidden popover should be skipped');
  await sendShiftTab();
  assert_equals(document.activeElement,button1,'Hidden popover should be skipped backwards');
  popover_no_invoker.showPopover();
  await sendTab();
  await sendTab();
  assert_equals(document.activeElement,popover_no_invoker,"Focusable popover that is opened without an invoker should get focused");
  await sendTab();
  assert_equals(document.activeElement,invoker0);
  await sendEnter(); // Activate the invoker0
  assert_true(popover0.matches(':popover-open'), 'popover0 should be invoked by invoker0');
  assert_equals(document.activeElement,invoker0,'Focus should not move when popover is shown');
  await sendTab();
  await sendEnter(); // Activate the invoker
  assert_true(popover1.matches(':popover-open'), 'popover1 should be invoked by invoker1');
  assert_equals(document.activeElement,invoker1,'Focus should not move when popover is shown');
  await sendTab();
  // Make invoker1 non-focusable.
  invoker1.disabled = true;
  assert_equals(document.activeElement,inside_popover1,'Focus should move from invoker into the open popover');
  await sendTab();
  assert_equals(document.activeElement,invoker2,'Focus should move within popover');
  await sendShiftTab();
  await sendShiftTab();
  assert_equals(document.activeElement,invoker0,'Focus should not move back to invoker as it is non-focusable');
  // Reset invoker1 to focusable.
  invoker1.disabled = false;
  await verifyFocusOrder([button1, button2, invoker0, invoker1, inside_popover1, invoker2, inside_popover2, button3, button4],'set 1');
  invoker2.focus();
  await sendEnter(); // Activate the nested invoker
  assert_true(popover2.matches(':popover-open'), 'popover2 should be invoked by nested invoker');
  assert_equals(document.activeElement,invoker2,'Focus should stay on the invoker');
  await sendTab();
  assert_equals(document.activeElement,inside_popover3,'Focus should move into nested popover');
  await sendTab();
  assert_equals(document.activeElement,invoker3);
  await sendEnter(); // Activate the (empty) nested invoker
  assert_true(popover3.matches(':popover-open'), 'popover3 should be invoked by nested invoker');
  assert_equals(document.activeElement,invoker3,'Focus should stay on the invoker');
  await sendTab();
  assert_equals(document.activeElement,inside_popover2,'Focus should skip popover without focusable content, going back to higher scope');
  await sendShiftTab();
  assert_equals(document.activeElement,invoker3,'Shift-tab from the higher scope should return to the lower scope');
  await sendTab();
  assert_equals(document.activeElement,inside_popover2);
  await sendTab();
  assert_equals(document.activeElement,button3,'Focus should exit popovers');
  await sendTab();
  assert_equals(document.activeElement,button4,'Focus should skip popovers');
  button1.focus();
  await verifyFocusOrder([button1, button2, invoker0, invoker1, inside_popover1, invoker2, inside_popover3, invoker3, inside_popover2, button3, button4],'set 2');
}, "Popover focus navigation");
</script>

<button id=circular0 popovertarget=popover4 tabindex="0">Invoker</button>
<div id=popover4 popover>
  <button id=circular1 autofocus popovertarget=popover4 popovertargetaction=hide tabindex="0"></button>
  <button id=circular2 popovertarget=popover4 popovertargetaction=show tabindex="0"></button>
  <button id=circular3 popovertarget=popover4 tabindex="0"></button>
</div>
<button id=circular4 tabindex="0">after</button>
<script>
promise_test(async t => {
  circular0.focus();
  await sendEnter(); // Activate the invoker
  await verifyFocusOrder([circular0, circular1, circular2, circular3, circular4],'circular reference');
  popover4.hidePopover();
}, "Circular reference tab navigation");
</script>

<div id=focus-return1>
  <button popovertarget=focus-return1-p popovertargetaction=show tabindex="0">Show popover</button>
  <div popover id=focus-return1-p>
    <button popovertarget=focus-return1-p popovertargetaction=hide autofocus tabindex="0">Hide popover</button>
  </div>
</div>
<script>
promise_test(async t => {
  const invoker = document.querySelector('#focus-return1>button');
  const popover = document.querySelector('#focus-return1>[popover]');
  const hideButton = popover.querySelector('[popovertargetaction=hide]');
  invoker.focus(); // Make sure button is focused.
  assert_equals(document.activeElement,invoker);
  await sendEnter(); // Activate the invoker
  assert_true(popover.matches(':popover-open'), 'popover should be invoked by invoker');
  assert_equals(document.activeElement,hideButton,'Hide button should be focused due to autofocus attribute');
  await sendEnter(); // Activate the hide invoker
  assert_false(popover.matches(':popover-open'), 'popover should be hidden by invoker');
  assert_equals(document.activeElement,invoker,'Focus should be returned to the invoker');
}, "Popover focus returns when popover is hidden by invoker");
</script>

<div id=focus-return2>
  <button popovertarget=focus-return2-p tabindex="0">Toggle popover</button>
  <div popover id=focus-return2-p>Popover with <button tabindex="0">focusable element</button></div>
  <span tabindex=0>Other focusable element</span>
</div>
<script>
promise_test(async t => {
  const invoker = document.querySelector('#focus-return2>button');
  const popover = document.querySelector('#focus-return2>[popover]');
  const otherElement = document.querySelector('#focus-return2>span');
  invoker.focus(); // Make sure button is focused.
  assert_equals(document.activeElement,invoker);
  invoker.click(); // Activate the invoker
  assert_true(popover.matches(':popover-open'), 'popover should be invoked by invoker');
  assert_equals(document.activeElement,invoker,'invoker should still be focused');
  await sendTab();
  assert_equals(document.activeElement,popover.querySelector('button'),'next up is the popover');
  await sendTab();
  assert_equals(document.activeElement,otherElement,'next focus stop is outside the popover');
  await sendEscape(); // Close the popover via ESC
  assert_false(popover.matches(':popover-open'), 'popover should be hidden');
  assert_equals(document.activeElement,otherElement,'focus does not move because it was not inside the popover');
}, "Popover focus only returns to invoker when focus is within the popover");
</script>
